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        //&&  与。。。。。||  或。。。。。。!  非
        console.log(3 > 2 && 3 > 7); //false
        console.log(3 > 2 && 7 > 3); //true
        console.log(3 > 5 || 4 > 1); //true  只要有一个是真的结果就是真的
        console.log(!true); //false
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